Gas burner



Aug. s, 1929. H, E, KERR 1,723,180

GAS BURNER Filed Apri; 29, 1926 (gn/vento@ H. E. KERR.

Patented Aug. 6, 1929.

UNITED STATES 1,723,180 PATENT OFFICE.

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GAS BURNER.

Application mea April as, 192e. serial n. 105,436.

bottom of which isuished and finishaiv My invention relates to animprovement in gas burners, and in general my 'object is to provide asmall burner or burner unit adapted to produce a spreading blue flame 5which .may be used with efficiency in small heating appliances, such ascoffee urns, ovens, cook stoves, gas ranges, and other heating apparatusin which a circular sheet of fla-nie may be advantageously applied to la superposed object.

In the accompanying drawing showing the preferred embodiment of myinvention, Fig. i

i 1 is a top view of the burner cap, and Fig. 2

a perspective view of the prong member l used to support saidburner cap.Fig. 3 is a bottom View of the prong member and cap assembled, and Fig.4 is a side View thereof. Fig. 5 is a side elevation of the mixing tubefor the burner alixed to a supply pipe coupling. Fig. 6 is a sectionalview of the complete burner mounted upon a supply.

pipe. v

The invention comprises a relatively small tube 2, preferably of brass,having a hexagonal enlargement; 3 at its lower end in which a cross-port4 intersects the lower end of an axial bore 5 extending the major lengthof the tube; Thelower extremity 6 of tube 2 is screw-threaded to permitattachment to a suitable base member 7 which in the present instance isshown as screwed to a pipe coupling 8 through which gas may be supplied.A short gas orifice 9 is provided axially in the base of the tube, thediameter of which is such that a' fine stream of gas is jetted undernormal pressure through the tube and to a substantial distance beyondthe mouth thereof. This stream of gas entrains a certain amount of airthrough the lateral ports 4, which entrained air is suilicient tomaintain a small blue flame at the mouth of the tube when the gaspressure is-reduced or turned down low compared with normal n pressureoperations. Then the gas is turned on full and discharged throughorifice 9 under normal pressure the force or velocity of the gas streamis such that a constant flame cannot be maintained opposite .the mouthVof the tube unless the gas is intercepted and mixed with additional air.Briefly, the gas will blow out. Having this characteristic of the gasdischarge tube in mind, I provide an intercepting plate or battle member10 the axis of which is coincident with the axis of the tube and thesmoothly. That is the bottom 11 of the plate opposite the mouth of thetube is preferably concaved and rounded and finished 'smoothly to mergewith an upwardly curved or rounded edge 12 of the plate. T hls plate is'also spaced a predetermined distance beyond the mouth of the tube, the

spacing means in the present device comprising a skeleton frame havingforked arms or prongs 14 extending on diverging lines from an angularbody part 15 having'a central opening to permit this part to be sleevedover tube 2 in rest position upon enlargement 3. The dished element orplate 10 is a separate cast iron member preferably, which is securedtothe diverging arms IJr prongs 14 as followsi'lhus the plate is providedwith notchees 16 'at uniformly spaced intervals radially at its edge,which notches correspond in number and position to the radial arms 14,and each arm vhas a curved seat1 i7 opposite a reduced extremity 18adapted to occupy notches 16. Arms 14 are made of malleable metal andwhen the plate is seated upon the arms the extremities 18 are bentinwardly to effect clamping engagement against the rounded portion 19 ofthe notch in plate 10, as shown in Fig. 6, thereby locking the vplaterigidly upon the arms.

' In operation, the gas .Y which is jetted through the tube strikes thecenter of the smooth round cavity or recess in the bottom of the plateand the gas is caused to spread radially in all directions toward theedge of the plate. Before escaping a thorough inter- Y around the edgeof the ring. When the gas is turned down and the Vvelocity of the streamof gas is not sufficient to cause the gas to strike the plate, suflcientair is taken in at ports 4 which is mixed with the stream of gas as itissues so that a blue iame will be maintained at the mouth of the tube.gas may be turned down, or the pressure may drop so that a mere bead offlame may be maintained at the mouth of the tube, without back-fire, andthe cap or plate covers the mouth of the tube completely and pro-- tectsit from` drippings or overflow from a vessel exposed to the flame.

A single burner or unit has been shown in the drawing, but obviously aseries of such The head or various styles of manifolds if 'desired foruse in portable bake ovens, doughnut stoves, etc., and the gas may be edintol either the side or bottom of the base member 5 or coupling for theburner tube. The prong member may be made of malleable iron or bronze,While the plate may be made of automobile cylinder iron, or any othersuitable metal adapted to withstand high temperatures. The cap or plateis mede separate from its skeleton supporting mem-v ber to permit therespective parts to be made of dierent materials and to permit the roundsurface of the cavity o1' pocket to be smoothly finished What claim, is:

l. A gas burner? comprising an air and gas commingling tube of smallcross section having air orices of restricted aree therein,. Handadapted to ]et under no1-mal ges pressure a stream of ges yand air asubstantial distance beyond the mouth of the tube, a forked membersleeved upon said tube having notched edges and a small circular platedetachably clamped between the notched edges of said forlted member,said plate being formed with a smooth centrally concaveshaped bottomencircled by a convex-shaped zone. 4

2. A gas burner, comprising an air and gas commingling tube of smallcross section and with air orifices of restricted area, a member havingdiverging arms extending angularly from said member beyond the mouth ofsaid tube, notches at the free end of said diverging arms and a smallcircular plate detachably clamped between said arms, said plate beingformed With a concave central bottom portion extending into aconvexshaped zone.

ln testimony whereof affix my signature.

HARRY E. KERK.

